3. Marta (Women's Soccer)

Marta is the best female soccer player in the world; it's as irrefutable as the sky is blue.

However, one player can only do so much as part of a whole team. Scoring opportunities are scarce, especially against defensive-minded adversaries.

No. 10 will certainly pad her individual stats, but Brazil expects championships. Although Marta will leave every drop of sweat on the field in attempting to bring one home, there are three teams currently ranked above the soccer powerhouse that resides in South America.

If Marta helps captures the gold for Brazil, Japan, Germany and the USA will have to collapse.

2. Michael Phelps (Swimming)

Or at least, his 2008 Olympic performance would lead one to believe so.

He sported a record eight gold medals around his neck before he was finished in Beijing, which is exactly why his 2012 outing could be considered disappointing to fans.

Laszlo Cseh, a fellow swimmer from Hungary, has acquired a medal in every tournament that he has participated in for the past 10 years. After witnessing Phelps showcase his skills in 2008, Cseh's conviction will be stronger than ever.

Phelps set the bar at a height that was previously undiscovered.

The only thing more difficult than climbing Mount Everest, is climbing it twice.